The object of the following short treatise on the Principles of Social-Democracy is to afford students and expositors of the subject a comprehensive view, such as we are bold to say has not hitherto appeared in this or any other language, at least in anything approaching the same compass, if at all. While the economic basis is dealt with at sufficient length, and, we hope, with the necessary clearness and thoroughness, we have not confined ourselves to this alone, but have endeavoured to show the bearing of Socialist principles throughout all the main departments of human thought and action. Our sketch in this respect has necessarily been slight, but we venture to think that the suggestions embodied in the following pages will be sufficient to enable any intelligent reader to follow them up for himself.